Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276683
D. Chang
The effects of multiple paths and channel capacity are concerned in the communication system. The SAS (smart antenna system) can solve these problems. The SAS can be separated by adaptive antenna array and MBA (multiple beams antenna array). In this paper, the MBA is discussed. There are different types of SAS that are developed in Taiwan for the applications of cellular phone system in GSM, WCDMA, and WLAN (wireless local access network). Key components such as wideband RP radiators and different kinds of RF BFN are developed for SAS. Several types of SAS with multiple beams and narrower beamwidth are developing and testing at Da Yeh University. The test results are quite agreed with that of simulation.
{"title":"The developments of smart antenna system at Da Yeh University","authors":"D. Chang","doi":"10.1109/ISAPE.2003.1276683","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276683","url":null,"abstract":"The effects of multiple paths and channel capacity are concerned in the communication system. The SAS (smart antenna system) can solve these problems. The SAS can be separated by adaptive antenna array and MBA (multiple beams antenna array). In this paper, the MBA is discussed. There are different types of SAS that are developed in Taiwan for the applications of cellular phone system in GSM, WCDMA, and WLAN (wireless local access network). Key components such as wideband RP radiators and different kinds of RF BFN are developed for SAS. Several types of SAS with multiple beams and narrower beamwidth are developing and testing at Da Yeh University. The test results are quite agreed with that of simulation.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125962599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276618
Sung-pyo Im, Sung-kyo Park, Choul-jun Park, Chong-baek Park
Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field E/sub tot/ at the near-field region between the simulation results and the experiment results. As a result, we could obtain the return loss of 29.786 dB at 2450 MHz only when the antenna is placed between two liver blocks of a pig, and the measurement results agreed with the simulation results well. Therefore, this coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.
{"title":"Characteristics of coaxial cable antenna with a ring slot for RTA","authors":"Sung-pyo Im, Sung-kyo Park, Choul-jun Park, Chong-baek Park","doi":"10.1109/ISAPE.2003.1276618","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276618","url":null,"abstract":"Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field E/sub tot/ at the near-field region between the simulation results and the experiment results. As a result, we could obtain the return loss of 29.786 dB at 2450 MHz only when the antenna is placed between two liver blocks of a pig, and the measurement results agreed with the simulation results well. Therefore, this coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129381164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276813
Wang Xianghui, Liu Xiaolong, W. Wenbing, Jiang Yangsheng
Through analytical integral, this paper first obtains the analytic representations of the transient radiation of antenna when the step pulse excites the aperture synchronously. After that it presents a quantitative analysis of relationship of the amplitude of the field to the pulse width of the rectangle pulse, the size of the aperture, the distance and the angle of the observation. The analysis indicates that the pulse duration of the field broadens as the plunge angle of the observation and the size of the aperture increases in /spl theta/ /spl ne/ 0/spl deg/, the pulse width of the field narrows as the distance of the observation increases in /spl theta/ = 0/spl deg/. The amplitude of the field augments yet the pulse width of the field tends to narrow as the plunge angle of the observation increases.
{"title":"A study on the amplitude of the aperture transient radiation in time domain","authors":"Wang Xianghui, Liu Xiaolong, W. Wenbing, Jiang Yangsheng","doi":"10.1109/ISAPE.2003.1276813","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276813","url":null,"abstract":"Through analytical integral, this paper first obtains the analytic representations of the transient radiation of antenna when the step pulse excites the aperture synchronously. After that it presents a quantitative analysis of relationship of the amplitude of the field to the pulse width of the rectangle pulse, the size of the aperture, the distance and the angle of the observation. The analysis indicates that the pulse duration of the field broadens as the plunge angle of the observation and the size of the aperture increases in /spl theta/ /spl ne/ 0/spl deg/, the pulse width of the field narrows as the distance of the observation increases in /spl theta/ = 0/spl deg/. The amplitude of the field augments yet the pulse width of the field tends to narrow as the plunge angle of the observation increases.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128703664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276631
Niu Jun-wei, Zhong Shun-shi
Microstrip bow-tie antenna (MBA) conformal to cylinder with small curvature radius is studied. The simulation of return loss and radiation patterns of one-element cylindrical conformal microstrip bow-tie antenna (CCMBA) and two-element CCMBA array is presented. It is shown that CCMBA with small curvature radius can also achieved a large bandwidth, though the resonant frequency and the radiation patterns are changed. Calculated results are in good agreement with measurements.
{"title":"Cylindrical conformal microstrip bow-tie antennas","authors":"Niu Jun-wei, Zhong Shun-shi","doi":"10.1109/ISAPE.2003.1276631","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276631","url":null,"abstract":"Microstrip bow-tie antenna (MBA) conformal to cylinder with small curvature radius is studied. The simulation of return loss and radiation patterns of one-element cylindrical conformal microstrip bow-tie antenna (CCMBA) and two-element CCMBA array is presented. It is shown that CCMBA with small curvature radius can also achieved a large bandwidth, though the resonant frequency and the radiation patterns are changed. Calculated results are in good agreement with measurements.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130197049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276628
K. Chung, A. Mohan
This paper presents a design of circularly polarised 4-element planar subarrays composed of low axial-ratio stacked patch elements in X-band. The wideband circular polarisation is excited using stacked circular disc and quasi-elliptical patch that printed on a superstrate with low dielectric constant (/spl epsi/ = 2.2) and a high dielectric constant (/spl epsi/ = 6.15) material as the substrate, respectively. The proposed element exhibits low mutual coupling in two principle planes that is comparable to a single-layer inside the subarray, a pair of microstrip-line fed elements was considered and arranged in four scenarios. Low sidelobe levels and 2-dB axial-ratio bandwidth of 19.5% in addition to a boresight axial-ratio of 0.15 are achieved. Variations in gain and axial ratio other than boresight (/spl theta/ /spl ne/ 0) in azimuth plane are also examined.
{"title":"Design of stacked circular/quasi-elliptical patch array for broadband CP applications","authors":"K. Chung, A. Mohan","doi":"10.1109/ISAPE.2003.1276628","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276628","url":null,"abstract":"This paper presents a design of circularly polarised 4-element planar subarrays composed of low axial-ratio stacked patch elements in X-band. The wideband circular polarisation is excited using stacked circular disc and quasi-elliptical patch that printed on a superstrate with low dielectric constant (/spl epsi/ = 2.2) and a high dielectric constant (/spl epsi/ = 6.15) material as the substrate, respectively. The proposed element exhibits low mutual coupling in two principle planes that is comparable to a single-layer inside the subarray, a pair of microstrip-line fed elements was considered and arranged in four scenarios. Low sidelobe levels and 2-dB axial-ratio bandwidth of 19.5% in addition to a boresight axial-ratio of 0.15 are achieved. Variations in gain and axial ratio other than boresight (/spl theta/ /spl ne/ 0) in azimuth plane are also examined.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130769361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276667
C. Luan, Y. Xi, D. Fang
In this paper, a novel feeding scheme of local oscillator feeding based on the near-field coupling is proposed. The coupling effectiveness between two single feeding elements as well as the microstrip arrays is investigated, showing that a good transportation of the power may be realized through appropriate design. In the feeding, both the amplitude and the phase of the feed-in signal are quite insensitive to the positional deviation caused by manufacturing and assembling tolerance. This good performance and its constructional simplicity make this method an attractive candidate for the local oscillator feeding scheme of large arrays.
{"title":"A novel scheme of local oscillator feeding based on the near-field coupling","authors":"C. Luan, Y. Xi, D. Fang","doi":"10.1109/ISAPE.2003.1276667","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276667","url":null,"abstract":"In this paper, a novel feeding scheme of local oscillator feeding based on the near-field coupling is proposed. The coupling effectiveness between two single feeding elements as well as the microstrip arrays is investigated, showing that a good transportation of the power may be realized through appropriate design. In the feeding, both the amplitude and the phase of the feed-in signal are quite insensitive to the positional deviation caused by manufacturing and assembling tolerance. This good performance and its constructional simplicity make this method an attractive candidate for the local oscillator feeding scheme of large arrays.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127916283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276648
J.A. Martinez, M. Arias, O. Rubiños, A. Pino
A rotationally symmetric reflector antenna with off-axis feeding system is presented to produce a number of sectorial and reconfigurable beams which are useful to be used for base stations in wireless local loop at microwave or millimetric bands.
{"title":"Design of a reflector antenna with several sectorial beams for WLL base stations","authors":"J.A. Martinez, M. Arias, O. Rubiños, A. Pino","doi":"10.1109/ISAPE.2003.1276648","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276648","url":null,"abstract":"A rotationally symmetric reflector antenna with off-axis feeding system is presented to produce a number of sectorial and reconfigurable beams which are useful to be used for base stations in wireless local loop at microwave or millimetric bands.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131315867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276732
H. El‐Ocla, M. Tateiba
In this paper, it is analyzed numerically the normalized RCS (NRCS) of partially convex conducting targets of large sizes of about five wavelengths in continuous random media. Here, we assume that waves around target are incoherent and the SLC keeps a finite value. In this work, we considered the case when the incident wave illuminates the convex portion of a concave-convex target. Here, it is analyzed numerically the ERCS in three regions of ka compared to SCL. For ka << SCL, NRCS equals two due to the double passage effect on waves in random media. As a result, it is concluded that in the regions ka << SCL and ka >> SCL, the ERCS is almost due to the double passage effect; and in between these two regions ERCS deviates from two depending on the SCL.
{"title":"Backscattering enhancement of partially convex targets of large sizes in continuous random media for e-polarization wave","authors":"H. El‐Ocla, M. Tateiba","doi":"10.1109/ISAPE.2003.1276732","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276732","url":null,"abstract":"In this paper, it is analyzed numerically the normalized RCS (NRCS) of partially convex conducting targets of large sizes of about five wavelengths in continuous random media. Here, we assume that waves around target are incoherent and the SLC keeps a finite value. In this work, we considered the case when the incident wave illuminates the convex portion of a concave-convex target. Here, it is analyzed numerically the ERCS in three regions of ka compared to SCL. For ka << SCL, NRCS equals two due to the double passage effect on waves in random media. As a result, it is concluded that in the regions ka << SCL and ka >> SCL, the ERCS is almost due to the double passage effect; and in between these two regions ERCS deviates from two depending on the SCL.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126623809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276771
T. Iyama, R. Yamaguchi, Y. Tarusawa, S. Uebayashi, T. Nojima
In this paper, the required dimensions of the flat-plane solid phantom are derived using the finite difference time domain (FDTD) method to obtain detailed SAR measurements that are equivalent to standardized procedures using the liquid. The proposed measurement system using the flat-plane solid phantom constructed using ceramic materials is presented and the system is validated by acquiring SAR distributions at 900 MHz for two types of antennas.
{"title":"Novel specific absorption rate (SAR) measurement system using flat-plane solid phantom","authors":"T. Iyama, R. Yamaguchi, Y. Tarusawa, S. Uebayashi, T. Nojima","doi":"10.1109/ISAPE.2003.1276771","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276771","url":null,"abstract":"In this paper, the required dimensions of the flat-plane solid phantom are derived using the finite difference time domain (FDTD) method to obtain detailed SAR measurements that are equivalent to standardized procedures using the liquid. The proposed measurement system using the flat-plane solid phantom constructed using ceramic materials is presented and the system is validated by acquiring SAR distributions at 900 MHz for two types of antennas.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126910735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276780
W. Yuan, E. Li, Yaojiang Zhang
3D Berenger's and uniaxial perfectly matched layers used for the truncation of the computational regions are theoretically studied respectively in the discrete space, including numerical dispersion and wave impedance, which can interpret the reason that the PMLs can effectively absorb the outward wave with any incidence, polarization, and frequency.
{"title":"Numerical dispersion and impedance analysis for 3D discrete perfectly matched layers","authors":"W. Yuan, E. Li, Yaojiang Zhang","doi":"10.1109/ISAPE.2003.1276780","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276780","url":null,"abstract":"3D Berenger's and uniaxial perfectly matched layers used for the truncation of the computational regions are theoretically studied respectively in the discrete space, including numerical dispersion and wave impedance, which can interpret the reason that the PMLs can effectively absorb the outward wave with any incidence, polarization, and frequency.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122321758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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